Quad ESL 57
Idealne do wzmacniacza lampowego.
Sprawne technicznie. Folie jak nowe. Żadnych trzasków, przebić itp.
Wizualnie jak na foto.

Dane techniczne:

Country:  Great Britain (UK)
Manufacturer / Brand:  Acoustical Manufacturing Co. Ltd, The; Huntingdon
Brand Quad
Year: 1956–1981 perfect model Category: Loudspeaker, headphone or earphone
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 220 Volt
Loudspeaker Electrostatic Loudspeaker (high bias DC voltage)
Power out 15 W (unknown quality)
Material Various materials
Shape Console, Lowboy (legs 50 %).
Dimensions (WHD) 867 x 787 x 266 mm / 34.1 x 31 x 10.5 inch
Notes
The Quad ESL 57 was manufactured for a long period because it was not easy surpassed for real quality sound. 93 dB/Wm. Impedance 15-30 ohms, frequency response 40 - 20 000 Hz (other source tells 45 - 18 000 Hz). Max. 33 Volts. Built-in DC-supply for polarization. The follower was ESL 63, followed by ESL-989. "Quad" is still producing and offers a homepage: quad-hifi.co.uk
Price given is for 1967/68.
Net weight (2.2 lb = 1 kg) 17.7 kg / 38 lb 15.8 oz (38.987 lb)